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# --coding: utf-8--

# 2017/8/5

'未被捕获的错误会一直上抛，最终被Python解释器捕获'

'''

def foo(s):

return 10 / int(s)

def bar(s):

return foo(s) * 2

def main():

bar('0')

main()

'''

'定义异常抛出'

class FooError(StandardError):

pass

def foo(s):

n = int(s)

if n==0:

raise FooError('invalid value: %s' % s)

return 10 / n

foo('0')